Chuck Gunderson (Some Fun Tonight) joins the show over two weeks for a look at the Beatles tours of North America.     This week: 1964.       We briefly revisit Ron Howard's "Eight Days a Week", and the first US visit before the main attraction:  August-September 1964.      Unlike a modern tour, Brian scheduled 32 shows in 26 venues in 24 cities over just 33 days, with long plane rides the norm rather than the exception.